Diving tank



Aug. 23, 1932, C. MEHL 1,873,617

l Y. DIVING TANK Filed Aug. 28, 1931 k3 Sheets-Sheet 1 INVENTOR. M

A TTORNE Y.

` 5 Sheets-Sheet 2 mm1 mm. am num. IWW

C. MEHL DIVING TANK Filed Aug. 28, 1931 Aug. 23, 1932.

,y INVENTOR. @Za/6%. @4M

ATTORNEY.

c. MEHL DIVING TANK I Aug. 23, Y1932.

Filed Aug. 28, l1931 s sheets-sheet 3 yfw'aw@ ATTORNEY.

IN VEN TOR.

f as lwill hereinafter more clearly appear, my`

Patented Aug. 23, 1932 'PATENT fOFQFICFE CHARLES MEHL, or PHILADELPHIA,PENNSYLVANIA pIVINe TANK Application led August 28, 11`931."57Seria1110.1559386?. i i

-v yThe olojectvof this invention is to devise.-

i a novel divingtank'whichis adapted for one man operation, and in whichthe tank 1s constructed in such a manner that the movis provided' with aseries of observation win- Ydows directed in dierent directions so that:the operator can always have` within his E vision the vohject which heisaseeking, even L 1G- though the tank is revolving.

A further obj ect of the invention is to pro-V Y of grappling armsandnovelmeans for con. trolling them from within the diving tank. :With theahoveand 'other objectslin view invention comprehends a novel divingtank. It further' comprehendsafnovel diving tank adapted for one manoperation having 20 a plurality of Vobservation Vwindowsfacing'indiferent directions, and provided with a novel arrangement andconstruction of grap- ;pling'arms and with novel means for controllingsaid arms. Y Y

iIt further comprehends a-novel construction andl arrangement ofjtank,and novel meansfo'r securing a'cable thereto..k Y' j It furthercomprehendsnovel` means for `cushioning the tank when ,itfreachesthe'bottom ofthe ocean bed orj the bedl of a waterway. A

-lt -urther comprehends a novel construe-- tion and arrangement ot arevolving seat for tlieoperator. v x Y y Gther' novel featuresiof)construction will jhereinafter fully appearin thez detailed de.scriptionand the appended claims.

For the purposev of illustrating the invenvtionI have shownv in the -vaccompanying "drawings la preferred-lembodiment Aof it A-whichinpractice will give satisfactoryand ",vreliable results. It is, however,to be underf'stood that. the various, instrumentalitiesfofY which myinvention `consists can .be variously arranged and organized, and the'invention 4is not-limited tothe precisezarra-ngement and organization ofthese instrumentalitiesl as i herein setforth. y 50 f liigure .1 `Vis aside .elevatiom partlybroken ure l. Y 5 ing parts are effectivelysealed. The tankVV Y e Figure 5 is-asec'tional View .of the showing thecalole connection. vide a novel construction vand arrangement' away, ofa diving tank embodying my invention. 1F K u y `Figure 2 is a section online 2--2 of Fig- Figure 3 is a sectional viewof a portionV of .agrapplingarm and its controlling mech- Figure e isa sectional view oftheforward end of a grappling arm. i

cover,

4Figure 6 is av detailed view showing the Aembodyinglmy. invention. :Thecasing l; is f `provided witha rounded bottom 2 and eX- tending downwardfrom the bottom 'are the wings 8 which are disposed-*at rightrangles ito each other so that when the diving tank: settles o n the bed ofawater .way the tank IwillA stay-in position without revolving I .alsoprovide 4cushioning memhersl injthe i form of plungers mounted .in thecasings 5, and between the upper end ofthe "plungers vand the upperwalls of the casings are interposedsprings 6, so that, whenthetankstrikes the bottom of the 'water Vway a mechanical cushion will heprovided. ,F our of these ,.cushioning plungers are provided in the`wings 3 circumferentially spaced around the I"bottom, and I also providea centrally disposed cushioningplunger 7 which is constructed andloperated ina similar manner tofthatof the plungers already'described;

The upper end of the tank is provided 'with a removable cap or closure 8having a downwardly. projecting threaded flange 9, the threads of whichare broken orintermit jtentfand lthe threadedwall 10 ofthe :open- Y ingat the upper endof the tank is', in a simi` lar v manner, providedl withyintermittent4 or brokenl threads, sothatV a tquickg detachableyAc-losurezis provided. l It zis thus unnecessary lil@ , closure and'tank. The closure8 is'provided with rarelief valve 12 controlling aircom-y Va number of ldifferent directions. l sure 8 is provided withrfourcircumferentlal-Y ly-spaced observation windows 13, which are which,when screwed into the wall of the tankV 1, prevent relative rotation ofsuch munication between the atmosphere and the interior of the tank, sothat the pressurecan be balanced after the tank is raised from'thewater.

The upper end of the tank 1 is provided" with an annular groove lasshownat,13rintoVv which extends an annularrib 14 on the bottom oftheclosure8,`and packingl is interposed between said rib and the bottom of the fannularY groove 13.1V providea 'series of observation Windows inorderthat the oper- Vator may be ablel to look out of the tank in i' Theclosealed in position: Y l Y At the-upper end` of the tank, I-also-'provide foury observation windows'14circumferentially spacedaround the side wall, and

directed upwardly at an'angle.` I also prol vide the observation windows15 Vwhich are cireumferentially spaced, four of them being employed, andthese extend laterally fro-m the side wall'of the tank. Below theobservationV windows 15, I'provide four down-1 fwardly projectedobservation 'windows '16, f Y vk cumference of the tank. 1 It will nowbe clear p circumferentially disposed around the cir- V VthatI'provide16 non-breakable windows which enable the operatorYQwithintheftank tosee in any direction.

, VThe cable 17 Yis connected withthe closure 8 in a novel manner, and`through this cable 'ext'ends the telephone connection 18, so that -thetelephone connectionis? properly pro` tected and no injury canoccur'toit unless the cable breaks. A fitting 19 is screwedlintoA theupper end of the closure V8y and in the j chamber of this fitting istubular packing 20 in the rform of reversely inclined cones which 5 arecompressed bymeans of a. glandf21 Y*against which bearsatubular closure22, which isprovided with a threaded extensionof'reduced diameterinthreaded engagementY with the fitting ,19. The-chamber ofthe Yfitting19 at its lower end is coneshaped toY conform to the contourjof thepacking, and,

the chamberV of the gland 21--isalso cone shaped to conform'to theportionof the packingr-with whichv it contacts.'v The upperY end jofftheYclosure S is providedV withA a cored space forming an annular channel23 across f Y which extends'a solid rod 24 whichisintegral with thecasting of which the vclosure 8 is" composedgji The cable 17 is woundaround V this rod 24 so thatthe strains ofthe cable are taken on thisrod; Theannular channel'23 communicates with the chamber 25, the wall ofwhich is cone shaped Vand diverges downwardly in order to provide forthe locking of the lower endfof the cable. The strands of the cable atthis point are divided and pressed outwardly, and the lower ends' of thestrands are wrapped around the rings 26. The space within this chamber25"- is then Vfilled Awith molten metalso that the lower end of thecable is securely anchored to the closure 8. 'Beneath theterminal of thelower end of. the .cable the wall of the casing is'threaded to r'eceivea closure disc 27. This closure 27 has a Ycontact member 28 inelectrical connection Vwith the cable 18, so that the telephoneconductor 29 leadingtov the telephone Y3 0 can, be vplugged in.` 31designates rthe oxygen breathing units,two lof which are suiiicientemployed,VV which will supply oxygen under atmospheric pressure for aperiodi of eighthours. The bottom of the tank has rising from itastandard 32 on vwhich-is mounted a revolving stool 33, hav- VVing alseat for theoperator, and thisfis ypref` erably mounted on lballbearings-34. a' j i As before explained,-I provide observation Ywindows'arranged'in sets of four, andfb'e-` `tween twoadiacent lowerobservation wm'- dowsl provide a-grappling' device havingV vitsown'findividual lcontrol located'within soY the tank in apositionaccessible to the opern ator. designates 'a grapplingarm, fourof which are employed,--and they' are Vcomosed of several movablyconnected sections so that the position o'fthegrapples or'hooks 36 maybe variedfas desired. Eachifgrappling arm is,V rotatably mounted. f vhand wheel ixe'd to the? hub of a gear 38vmounted ona stud shaft 39carried `by the machine frame. The gear` 38 37 designatesr a meshes witha gear 40iixedto a gearr41 which f latter is 'mounted ony a stud shaftV42. The gear 41 meshes with agear 43D fixed toa reduced extension 44 ofa4 grappleV carrying member inthe form of a slotted support 45.

This reduced extension 44 extends Vthrough an 'opening in the side wallof the diving'tank Vfandcarries a thrus'tbearin'g 46 lwhich bears V licagainst` the-.juxtaposed recessed wall 'off-'the Y tank and the innerenlarged end I of Vthe grapple Yarm support45 with which coopf eratesa'packing 48 which is retained ini positionl by means of agland 49. Itwill thus-be 'seen that if the hand wheel 37 is revolved the grapple armsupport'45 will also be revolved.

V510* designates the first movable section ofthe grapplearm whichis-provided atits inner end with a bifurcated Vportion 51jwhich extendsinto'the support45 and is pivoted thereto'by meansof the pivoted members52 which form trunnions. The'movable section l50 at its outer end isbifurcatedto receive the bifl'ircatedl end of the movable section 53.which is pivotally connected therewith as atdft.

Y The hooks' 36 are pivotallyfsupported at inthe bifurcatedend of anapertured arm -section 56; Theinner ends of the hooks are pivotally.connected :to 'oneend of the links 57, the opposite ends of'which arepivotally connected to an` arm 58 fixed to a rod59. rl `he outer end ofthe arm 53 isfrecessed to receive av ballbearing- 60 which also bearsagainst a shoulder on'the arm 58 and' this i arm :is rotat= v ablymounted in the movable section 53' andis retained in place by means 'ofal cap vnut 61 which is screwedinto the outer recessed end of themovable section`53. The rod 59 has adjustably mounted thereon a setcollar'62 be- -tween Which'and a Wall ofthe movable'se'c'- tion 53 isinterposed a spring 63.- The'rodp59 has connected with its rear endacable 64 which extends rearwardlyand is connected to a controlling rod`65 which Ais provided With `a graspinghandle 66.- The cable 64: rpassesthrough afbearing sleeve 67 in the movable grappling arm section 50 andthe controllingrr rod 65 :passes through a bearing sleeve 68.

The controlling rod 65 also passes through the base block of a handle 69Whichis retained imposition by means of a Washer 70 seat-ed .in agroove71fin the base plate. 'The Washer is secured by means of fasteningdevices 72 tothe gear case 7 3 whichlatter issecured to the tank by(means of fastening'devicesvv/l.

AThe controlling 'rod 65 is threadedV for al portionof its length asat75v and with' this :threaded portion cooperates thef locking levers 7 6having threaded segments tozengage Athe 'threads' -75 of the`controlling 'rod' r65.

levers 76 are pivotally mounted i on the rods l77 carried by the wheel.69 and i theyl vare `provided -With reversely .inclined These lockingfaces 78 with Which `cooperates thespring `l`pressed stops 79-Whichholdthe locking levers 76 in their locked Vor unlocked position.

. V'The first movable section 50ct a grappling "arm Vis controlled by ahandlewheel 80 iiXed .to the hub .of a gear-81 mounted on the studV.sl1aft82. The 'gear 81meshes `with a gear 83 oni a shaft 84:. Thegear83 meshes Witha gear i 85 fixed to a gear .sleeve 86-Which ismountedinthe rear end of lthesupport'l and at its-forwardendit haslixedto it a gearv 87 which :meshes with a gear 88'fixed tothe innervend of the grapple armv '50.1.- Itwill thusbe ,seenthatfwhen thegearf80 is revolved the r movable arm section 50 Will be swung onitspivots 52 in one'direction orthe other. The movable armsection 53 iscontrolled by the lis providedwitha gear 97 Whi'chmeshesvvithVaga-instfthe gear casing toretainfthe:locking Y also Vbeflocked in theyposition to` which they,V

ing-sleeve 68 and meshing With a gea'i` l.9.5. Which mesheswith agear 96.fixed 'to the bear'- ing sleeve .67 rlhe.sleeve67'atfits outer end agear 98 iXedto the inner end of the second movable grappling arm.section .53,fso' that :.Whenfthe `handle Wheel 89 v is'revolved'ztheVVgrapplin-g'arm''section 531will be'moved on its pivots 54k inonedire'ctio'n or the otherf@ Ther-.rotatable grapple varm .support T45;nisU15 recessed to receivethe gear carrier 862'and` thrust=bearing .99is 'providedbffv Aisealing Washer 100 is interposedfas shown in Figure 3anda threaded vgland 101 retains thisvash-n v er in position. w Asealinggasket is alsoJemf ployed as 'shown at `:102 "and aI gland.1.108.` vin threaded `engagement with the gear carrierv 86bearslagainst suchsealingWasher. Y

In order to retain thfevcontrollin"members justed have provideda'locking'memberfor eachofthemf'f# ""f' The gear 381 c'ontrolledby' thehand vWheel fin the-position 'to Whichthey have .beenafd-f5L85 37 isretained in its locking position'by means n With gear teeth' to'interlock'fvvith the-teeth of the gear 88 and its shank is encircledby aspring Whichbears-iagainst the-head of thelocking member and .thegear-'casingf' rounded eccentric lportion r of; which bears member 104in its unlocked position. The gear 8l controlled bytheihand Wheel 80'issecured in locked =or unlockedpolsition by` means of the locking member108y constructed and operated in" a snmlarimannerto thatiot saryduplication. l rf In a similar'imanner the hand-Wheel 89. is lretainedin its locked or unlocked positionl 1 by means or" `aflocking member-109 Which'zhas a gear-segment interlocking with thexteeth`ofthegeai-90.f-'A f i ..1

It Will thus be-seenthat at'the Williof; the i Y operator the-grapplingrodmayl be n'ioved,V

inwardly or outwardly tof close; oropen the grappling hooks 36'anditcanl also-Elbe rotated as desired bythe hand` Wheel '69 .which islocked thereto bythe Ylocking Vlevers 76.

The movable section 50 can beY swung i `its pivots by 'rotationofthe'hand. ivheel 80 andthe outer movable section'l can be swung on itspivots Yby rotation offthefhand Wheel89. y These segments '50 and53'jcan have been'adjusted byimeansfof locking j members' `108 and 109respectiveylyg *of-the locking member-lOetwhfich is providedg Theshank'fof the locking `member i10 t-eX-5"95 4`tends throughthe.gearfcasingandhas -ecce'nv -trically connected with iti al Vhandle2106,' #the f thel llocking member l v 104: so that s a detailed*105description thereof Wouldinvolve unneces Y It will now be v Yance iwiththis invention I `have devisedy ai novel d1v1ng tank wherein a novelconstrucand thus form a closed eye to retain anyl ar- 'the' headedplungerjs 4, thedownward position of .which is limited-by means of thenuts 113, it being understood that the' shanks of the r plungers extendthrough-lthe 'apertures 1 ofthe nuts 113. Theprassa/ges 114 lead Vfrom[the cylinders 5 tothe chambery 115 in whichv is mountedA a lvalve-sum1116 which `is' lWing i s hapedftoV form apertures 117, th e stemcarryingthe valve 118, Whichvlatter is adapted 15 to seat in the valveseat 119 and' thus close ytheinletvpassage 120 in thevnut121. Thevr,branch conduits 122 are ofreduceddiameter and lead' from the passagesv114C throughv the Y .ports 123 controlled by the; outwardly open- 20.ing valvel24 having a wing shaped stem, so

that, the waterinthe cylinders 111 can slowly escapeV through thedischarge pas-V sages 125Y when the plungersY 4 strike the i.

bottom of a yWater way. It willV thus be seen that Iprovide anlautomaticYYhydraulically Y' y'actuated cushioningdevice for the diving .-tankL vy v "apparent that in accordtion y*and arrangement of;V grappling armsare provided' which enables'one to Work itfany one thousand feet. 'Thetelephone connection is Within the cable sothat it cannotbe injuredwithout the breaking of the cable. Y

' 'The closure is sealed in position and. owing 7 to the interruptedthreads va quick locking device is provided'so that a man can be sealed*o in or removed fromthe diving tankinabout Y* one minutes time. l

' VAll'the movable joints ,of the grappling.

' `arms' vareeequipped with thrust bearingsto take up the heavy strainstovvhichtheyQarer;`

'a subjected.V .TheV revolving Vstool. 'permits the i' v 'i and sealedin:saidiconicallyshaped chamber.

.4i-In a diving; tank;l ajchamberedtank, f a

l cover having a quick' detachable connection operator to turn quicklyin any direction.

The diving tank is provided with two sepa- 1 Y rate oxygen breathingVunits which enables v oneztolbreath oxygen under atmospheric presfsureF'or-afperiod of eight hours; .-1 Y ,i

1 -"The equalizing valve equalizes the Vpressure inthe tank in case ofemergency. f l provide bothmechanical and automatic shock absorbers toprevent the operator Jfrom becoming hurt V`when the ltank reaches thebedof a Water Way. VI provide` sixteen un- -Y breakable Windows Whichenables the o'per-V V"atorfto see inanydirection. f y l .I'also providea novelfco"V er lockingdevice so that'thel Vgrappling hooks will hold..onto "any objectfwithout requiring the use ofthe hands oftheoperator'lalso provide a quick f Y locking'device to holdfthe grappling arm'vto YY ,means in saidwings. angle in depths-.ofwaterup to approximately ncushioningfmeans atthebottomfof said tanks Wingsf disposed yat :anyangle to yeach yother shown Lcertainiof;thengearsof,thewspnr, type ,l Y

Y but they would preferably all .be spiral gears.

The telephone connectionpreferably-"ex- 1tends through aninsulatingsleeve 126. The c losurediscj 27-bears against a packingg127so that the inner fend of the cable connection .is effectively sealed.'V

In Vorder that the cable 17 :removed i y .when vdesired lthegjnoltenmetal; which-,is pouredin to ,bind the inner strands in position ,isreceived. in. acasing 128, see Figuren.

I It will now be apparent that Ihave devised a nevi7 anduse-fuldi'vifngtank which embodies lthe features-of. advantageenumerated asdel sirable in the statementlof :the: invention vandtheabovee description, -andfrvhile I have, in

the presentV instance, shofwn and describedfa .preferred VexnboClimentthereoffzwhich y@will give inv practice satisfactory landreliable .fre-

sults, it is `to'be understoodthat lthis V embodi-f` ment issusceptibleof mo'diication'in ,various particulars Without departing fromthe spiritof its advantages.V

f1;;In a-diving tank, asealed yor. scopey l,of the invention orisacrificing anyV top closure, ,Wingsfdispos'edat Vanfang-le` anddepending fromy the?Y bottom of :said tank .to

form chambers, and r hydraulic f cushioning 2.? In f a diving tank,

lat thef'bottom @of the tank in which said.mechamcalchshioningmeans.ismounted, and automatic ,hydrauliccushioningmeans atthe through thebottomeof` the cover, .andaj cable in saidchamber andwoundaround saidrod 1 With saidl tank and`sealedf'thereto',;gsaid y cover i 'having' an. annular. chambersurrounding a- ,transverse rod opening through the topgofthe cover and'openinginto alconical vaperture leadingfthrough"the bottomof the,cover, a

cable in said'f'chamber surroundingfsaidfrod, and4 having its' strands.extending into said chamber Vand separated,f andV :locked ltherein Withmelted` material, antelephoneconnection leading v'through said cable,and. 'la teleA phone within the tank communicating with said telephoneconnection.V

, v5.1InfaY diving tankyatankhavingvviiigs i at'its bottom, disposed at;right anfglesto each other and'` hydraulic cushioning members at anypositionto which ithas been adjusted.

p vthefbottoniof said tank comprisingjcylinder'sf 'Y Y @For convenienceof illustrationl'IA have mounted Vin saidgwings, :plungerslwithingsaid513 cylinders, inwardly opening automatic inlet valves in communicationwith said cylinders, and outwardly opening automatic discharge valves incommunication with said cylinders.

6. In a diving tank, a sectional grappling arm comprising an arm supportrotatablymounted on the tank, a section movably connected with saidsupport, a second section movably connected with said first section,grappling hooks mounted for bodily rotation in said second section, aspring actuated rod to which said hooks are operatively connected,independent gear connections for each movable section, controlling meansfor said gears, a cable connected with said rod, a longitudinallymovable controlling rod connected with said cable, a rotatable handwheel, and means carried by said hand wheel to interlock with saidcontrolling rod.

7 In a diving tank, a grappling arm comprising an arm support rotatablymounted on the tank, an arm section movably connected with said support,a second arm section movably connected with said first arm section,grappling hooks mounted for bodily rotation in said second arm section,a longitudinally movable controlling rod operatively4 connected withsaid hooks to actuate them, a rotatable hand wheel, locking leverscarried thereby to engage said controlling rod, and means to retain saidlocking members in their locked or unlocked positions.

8. In a diving tank, a tank having wings projecting downwardly from itsbottom and disposed at right angles to each other, spring pressedplungers carried by said wings,'and automatic hydraulic means to form acushion for said plungers.

9. In a diving tank, a tank, a cover sealed therewith and provided withan upwardly extending portion, a packing member sealed with said coverand having a cable receiving aperture, a supporting cable, said coverhaving an annular passage traversed by, a cross rod, said cable passinginto said space and around said cross rod, said cover havingacone-shaped chamber communicating with said'passage, the free ends ofsaid cable being spread out laterally in said chamber and anchoredtherein, a closure sealing the lower end of said chamber, a telephoneline within said cable, and a socket in said closure connected with saidtelephone line.

10. In a diving tank, a tank adapted to receive an operator, a grapplingarm carried by said tank and comprising a support rotatably carried bysaid tank, a movable section pivotally connected with said support, asecond movable section pivotally connected with said first movablesection, an arm carrying section rotatably mounted in said secondmovable section, grappling hooks pivotally mounted supported on said armsections, a flexible cable connected with said hooks and passing throughsaid movable sections, yielding means 4to 'cause the A'closing movementof said hooks,- aifcontrollingvr rod connected withl said cableandextendinginto the tank, and a graspinghandle'for actuating` said"controlling rodfand@thereby said Y.

bysaid first `movablesection,:.anarm section rotatably mounted in saidlsecfondq-movableV section, grapplinghooks carried by said arm, section,a cable operativelyconnected with saidi grappling hooks` andextendingthrough.

said movablesections, a controlling frod con-gl ',nected rwith .saidcable, a bearing sleeve through which` said controlling f rod passes,and lockingjmeans cooperatingwith saidcontrolling r'od tof retain it inthe position to which it-hasbeen adjusted.`

12;,In a diving tank,va tank, a grappling arm comprising asupportrotatably mounted in the wallof the tankfa'- movable section pivotedv tosaid supporta lsecond*` movable` Y section kpivotally carried by saidfirst movable section, an .arm section rotatable in said sec-- ondmovablesection, vgrapplingyhooks car-` ried. by saidz arm section, aflexible cable-*connected with ksaid grappling hooks vand jextendingthroughsaid `movable sections, a

controlling rod mounted insaid support con-Q nected with said..flexible'cable .andlhaving threaded portions,` manually ,actuated lockingmechanism cooperating with saidthreaded portion to 4reta-inthe grapplinghooks in Y the position to which they have been adjusted,

spring pressed stops to retain said locking members in locked orunlocked position, manually actuated means to revolve said support, andmanually'actuating means to effect relative movement of said sections.

13. In a diving tank, a tank, a grappling arm carried by said tank andcomprising a support rotatably mounted in the wall of said tank, amovable section pivotally carried by said support, a second movablesec-V tion pivotally carried by said first movable section, an armsection rotatably mounted in said second movable section, ,grapplingvhooks carried by .said arm, a flexible cable connected with saidgrappling hooks and extending through said sections, a controlling rodloosely mounted in said rotatable support and connected with saidiiexible cable, locking means cooperating with said controlling rod toretain it in the position to which 1t,v

has been adjusted bythe operator, manually actuated means intergearedwith said .sup-

port to revolve it, locking means for such" gearing, manually actuatedgearing to effect relative movement of said first movable section andsaid support, locking means for said last mentioned manually actuatedgearing,

u ianuallyactuated gearing-forefecting rela-' e.

tive Vmovement between Vsaid secondi` movable SectionL Vand Vsaid ,firstmovable -sectio`n, andV L Vlockingmeans'lforthe gearing-for controllingrelative'movementfbetween saidffrs't land y second sections. 1 Y uw y i1.4:."Ina diving tank; a tankga grappling it f y Varm''Comprising y'asupport rotatably mounted Y in the vva'll- Voffsaid"v tank, agmovablesection Y Y l Yj() pi-votz'illycarried` by saidfsupport, a secondmovable section pivotally vcarried vby said first movable section,fan*amirseetion rotatably mounted- 'in said second movable section',Vgrappling hooksearried-.by said Yy arm' Vse'etioxu'. gearing [for saidYsupport i Yandintergeared with said irstvmovable sec-1 tion toeffect'relative movement of it with said support, manually controlled'gearing intergeare'd with-said .second movable section and. Wit-h'-fsaid first gearing to effect rela-tive 130 movement of said'rst andsecond sections,Y Y f and locking means carried-by saidhandle .andcooperating with said 4 controlling rod to secure it in the position towhich it has beenv adjusted an'dthereby secure saidg'rappling y a hooksin the position' to which they have been Y adjusted.

. Y .f CHABLESMEHL.

